Beware the "Red Rock Opium" - it's just "Dragon's Blood Incense" sold on the streets because it makes this nice bubbly burn when ignited. Apparently they tell you to sprinkle the chunks on top of a full pipe, in hopes you won't notice the lack of a more significant buzz.

When I was 18 I smoked a joint that had it in it, (and was the type that only smoked pot like 3-5 times a year) ... and I did not know this joint had opium in it. It was passed back and fourth 3 times... between me and this guy. when I went for my 3rd, the room was spinning..and I could not get the joint to my face... I said WTH? and he laughed and said "doesn't Opium rock" I tried to walk to the bathroom, and ended up in the kitchen opening the fridge looking for the bathroom. I woke up next morning in a puddle of spilt dog water, and lettuce on my face. It was morning however I have no idea how many hours I was sleeping or what time I smoked it... and when I got to my car, I fell a sleep... woke up at 7 thinking it was 7am I went to McDonalds drive through and ordered an egg/cheese biscuit... then found out it was PM and not AM